1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 14 * 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay (at) cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) from 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] */ 56 57 #include <openssl/asn1.h> 58 59 #include <openssl/asn1t.h> 60 #include <openssl/mem.h> 61 62 63 static void asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int combine); 64 65 /* Free up an ASN1 structure */ 66 67 void ASN1_item_free(ASN1_VALUE *val, const ASN1_ITEM *it) 68 { 69 asn1_item_combine_free(&val, it, 0); 70 } 71 72 void ASN1_item_ex_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 73 { 74 asn1_item_combine_free(pval, it, 0); 75 } 76 77 static void asn1_item_combine_free(ASN1_VALUE **pval, const ASN1_ITEM *it, int combine) 78 { 79 const ASN1_TEMPLATE *tt = NULL, *seqtt; 80 const ASN1_EXTERN_FUNCS *ef; 81 const ASN1_COMPAT_FUNCS *cf; 82 const ASN1_AUX *aux = it->funcs; 83 ASN1_aux_cb *asn1_cb; 84 int i; 85 if (!pval) 86 return; 87 if ((it->itype != ASN1_ITYPE_PRIMITIVE) && !*pval) 88 return; 89 if (aux && aux->asn1_cb) 90 asn1_cb = aux->asn1_cb; 91 else 92 asn1_cb = 0; 93 94 switch(it->itype) 95 { 96 97 case ASN1_ITYPE_PRIMITIVE: 98 if (it->templates) 99 ASN1_template_free(pval, it->templates); 100 else 101 ASN1_primitive_free(pval, it); 102 break; 103 104 case ASN1_ITYPE_MSTRING: 105 ASN1_primitive_free(pval, it); 106 break; 107 108 case ASN1_ITYPE_CHOICE: 109 if (asn1_cb) 110 { 111 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL); 112 if (i == 2) 113 return; 114 } 115 i = asn1_get_choice_selector(pval, it); 116 if ((i >= 0) && (i < it->tcount)) 117 { 118 ASN1_VALUE **pchval; 119 tt = it->templates + i; 120 pchval = asn1_get_field_ptr(pval, tt); 121 ASN1_template_free(pchval, tt); 122 } 123 if (asn1_cb) 124 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL); 125 if (!combine) 126 { 127 OPENSSL_free(*pval); 128 *pval = NULL; 129 } 130 break; 131 132 case ASN1_ITYPE_COMPAT: 133 cf = it->funcs; 134 if (cf && cf->asn1_free) 135 cf->asn1_free(*pval); 136 break; 137 138 case ASN1_ITYPE_EXTERN: 139 ef = it->funcs; 140 if (ef && ef->asn1_ex_free) 141 ef->asn1_ex_free(pval, it); 142 break; 143 144 case ASN1_ITYPE_NDEF_SEQUENCE: 145 case ASN1_ITYPE_SEQUENCE: 146 if (!asn1_refcount_dec_and_test_zero(pval, it)) 147 return; 148 if (asn1_cb) 149 { 150 i = asn1_cb(ASN1_OP_FREE_PRE, pval, it, NULL); 151 if (i == 2) 152 return; 153 } 154 asn1_enc_free(pval, it); 155 /* If we free up as normal we will invalidate any 156 * ANY DEFINED BY field and we wont be able to 157 * determine the type of the field it defines. So 158 * free up in reverse order. 159 */ 160 tt = it->templates + it->tcount - 1; 161 for (i = 0; i < it->tcount; tt--, i++) 162 { 163 ASN1_VALUE **pseqval; 164 seqtt = asn1_do_adb(pval, tt, 0); 165 if (!seqtt) 166 continue; 167 pseqval = asn1_get_field_ptr(pval, seqtt); 168 ASN1_template_free(pseqval, seqtt); 169 } 170 if (asn1_cb) 171 asn1_cb(ASN1_OP_FREE_POST, pval, it, NULL); 172 if (!combine) 173 { 174 OPENSSL_free(*pval); 175 *pval = NULL; 176 } 177 break; 178 } 179 } 180 181 void ASN1_template_free(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt) 182 { 183 size_t i; 184 if (tt->flags & ASN1_TFLG_SK_MASK) 185 { 186 STACK_OF(ASN1_VALUE) *sk = (STACK_OF(ASN1_VALUE) *)*pval; 187 for (i = 0; i < sk_ASN1_VALUE_num(sk); i++) 188 { 189 ASN1_VALUE *vtmp; 190 vtmp = sk_ASN1_VALUE_value(sk, i); 191 asn1_item_combine_free(&vtmp, ASN1_ITEM_ptr(tt->item), 192 0); 193 } 194 sk_ASN1_VALUE_free(sk); 195 *pval = NULL; 196 } 197 else 198 asn1_item_combine_free(pval, ASN1_ITEM_ptr(tt->item), 199 tt->flags & ASN1_TFLG_COMBINE); 200 } 201 202 void ASN1_primitive_free(ASN1_VALUE **pval, const ASN1_ITEM *it) 203 { 204 int utype; 205 if (it) 206 { 207 const ASN1_PRIMITIVE_FUNCS *pf; 208 pf = it->funcs; 209 if (pf && pf->prim_free) 210 { 211 pf->prim_free(pval, it); 212 return; 213 } 214 } 215 /* Special case: if 'it' is NULL free contents of ASN1_TYPE */ 216 if (!it) 217 { 218 ASN1_TYPE *typ = (ASN1_TYPE *)*pval; 219 utype = typ->type; 220 pval = &typ->value.asn1_value; 221 if (!*pval) 222 return; 223 } 224 else if (it->itype == ASN1_ITYPE_MSTRING) 225 { 226 utype = -1; 227 if (!*pval) 228 return; 229 } 230 else 231 { 232 utype = it->utype; 233 if ((utype != V_ASN1_BOOLEAN) && !*pval) 234 return; 235 } 236 237 switch(utype) 238 { 239 case V_ASN1_OBJECT: 240 ASN1_OBJECT_free((ASN1_OBJECT *)*pval); 241 break; 242 243 case V_ASN1_BOOLEAN: 244 if (it) 245 *(ASN1_BOOLEAN *)pval = it->size; 246 else 247 *(ASN1_BOOLEAN *)pval = -1; 248 return; 249 250 case V_ASN1_NULL: 251 break; 252 253 case V_ASN1_ANY: 254 ASN1_primitive_free(pval, NULL); 255 OPENSSL_free(*pval); 256 break; 257 258 default: 259 ASN1_STRING_free((ASN1_STRING *)*pval); 260 *pval = NULL; 261 break; 262 } 263 *pval = NULL; 264 } 265
